Inspection device and inspection method

ABSTRACT

A first conductive contact connecting a first electrode of an inspection circuit board and one external electrode of a semiconductor integrated circuit is arranged in a fixed member. A second conductive contact connecting a second electrode of a wiring board and the other external electrode of the semiconductor integrated circuit is arranged in a movable member. A third conductive contact connecting one third electrode of the inspection circuit board and the other third electrode of the wiring board is arranged in the movable member. The other third electrode is connected to the second electrode. When the movable member moves to the contacting position, the second conductive contact makes contact with the other external electrode, and the third conductive contact makes contact with the one third electrode.

FIELD OF THE INVENTION

The present invention relates to an inspection device and inspectionmethod for measuring and inspecting electric characteristics of asemiconductor integrated circuit having electrodes on two opposite facesthereof, by use of a measuring device.

BACKGROUND OF THE INVENTION

When electric characteristics of a semiconductor integrated circuit areinspected, there is generally used an inspection device electricallyconnecting an external electrode of the semiconductor integrated circuitto a measuring device and performing inspection. As a prior artinspection device, there is an inspection device 82 using a pogopin type(spring-incorporating contact pin) conductive contact 81 illustrated inFIG. 20.

The pogopin type conductive contact 81 has arranged in the interior of acylinder body 83 thereof a coil-shaped compression spring 84, oneplunger 85 and the other plunger 86. A tip end of the one plunger 85protrudes upward from the cylinder body 83 in an advanceable andretractable manner; a tip end of the other plunger 86 protrudes downwardfrom the cylinder body 83 in an advanceable and retractable manner. Thecompression spring 84 is arranged between the one plunger 85 and theother plunger 86, urging the two plungers 85 and 86 in a protrudingdirection.

By means of expansion and contraction of the compression spring 84, theone plunger 85 is pressed against an external electrode 88 of asemiconductor integrated circuit 87 and at the same time, the otherplunger 86 is pressed against a land electrode 91 of an inspectioncircuit board 90 connected to a measuring device 89. Consequently, theexternal electrode 88 and the land electrode 91 are electricallyconnected through the two plungers 85 and 86 and the cylinder body 83.

The inspection circuit board 90 is arranged in one direction relative tothe semiconductor integrated circuit 87, i.e., in a direction oppositeto a face where the external electrode 88 is formed. The reason for thisis to electrically connect the external electrode 88 and land electrode91 at a shortest distance by use of the conductive contact 81.

In recent years, with increasing requests for high density ofsemiconductor integrated circuit, in order to allow a package-on-package(hereinafter, POP for short) structure stacking semiconductor integratedcircuits after assembly, there have been developed as a newsemiconductor integrated circuit package configuration, semiconductorintegrated circuits having electrodes on each of the two opposite facesthereof; thus, an inspection device capable of handling suchsemiconductor integrated circuit structure is required. Also, as theoperating speed of electric signal between the stacked semiconductorintegrated circuits increases, as for the inspection device, improvementin electric performance, i.e., loss reduction of transmission path isrequired.

In Japanese Patent Laid-Open No. 2001-208793, there is described aninspection device for a semiconductor integrated circuit provided with apogopin type (spring-incorporating contact pin) conductive contact.

However, as illustrated in FIG. 21, when the inspection device 82described above is used for an electric characteristics inspection ofthe semiconductor integrated circuit 87 having external electrodes 88 aand 88 b on two opposite faces 87 a and 87 b, the following problemarises.

In the prior art inspection device 82, the inspection circuit board 90is arranged in one direction relative to the semiconductor integratedcircuit 87. Accordingly, when the external electrode 88 a on the oneface 87 a of the semiconductor integrated circuit 87 is placed in amanner facing the inspection circuit board 90, it is difficult toelectrically connect the external electrode 88 b on the other face 87 bof the semiconductor integrated circuit 87 and the land electrode 91 ofthe inspection circuit board 90.

Thus, as illustrated in FIG. 22, in the one face 87 a of thesemiconductor integrated circuit 87, there is additionally provided aplurality of inspection-use external electrodes 93 connected to theexternal electrode 88 b on the other face 87 b through the interior ofthe board. By use of the conductive contact 81, the external electrode88 a on the one face 87 a and the land electrode 91 of the inspectioncircuit board 90 are electrically connected and at the same time, theinspection-use external electrode 93 on the one face 87 a and the landelectrode 91 of the inspection circuit board 90 are electricallyconnected. Accordingly, the external electrodes 88 a and 88 b on the twofaces 87 a and 87 b of the semiconductor integrated circuit 87 areelectrically connected to the land electrode 91 of the inspectioncircuit board 90, whereby an inspection can be performed for thesemiconductor integrated circuit 87.

However, since the inspection-use external electrode 93 are provided inaddition to the external electrodes 88 a and 88 b, the number ofexternal electrodes 88 a, 88 b and 93 of the semiconductor integratedcircuit 87 increases. Consequently, there arises a problem that theoverall size of the semiconductor integrated circuit 87 becomes larger,thus limiting effects of high density achieved by stacking.

Consequently, an object of the present invention is to provide aninspection device and inspection method capable of inspecting electriccharacteristics of a semiconductor integrated circuit having electrodeson two opposite faces thereof without arranging any inspection-useexternal electrode in the semiconductor integrated circuit.

DISCLOSURE OF THE INVENTION

According to a first invention, there is provided an inspection devicefor inspecting electric characteristics of a semiconductor integratedcircuit having one external electrode and the other external electrodeon two faces thereof, the two faces being opposite to each other,wherein an inspection circuit board having a first electrode and awiring board having a second electrode are arranged facing each other; ameasuring device is connected to the inspection circuit board; a holdingpart holding the semiconductor integrated circuit is formed between theinspection circuit board and the wiring board;

a first conductive contact making contact with the first electrode ofthe inspection circuit board and the one external electrode of thesemiconductor integrated circuit facing the inspection circuit board toelectrically connect these electrodes is arranged in a fixed member; asecond conductive contact making contact with the second electrode ofthe wiring board and the other external electrode of the semiconductorintegrated circuit facing the wiring board to electrically connect theseelectrodes is arranged in a movable member; the wiring board is arrangedin the movable member; the movable member is movable to a contactingposition at which the second conductive contact makes contact with theother external electrode of the semiconductor integrated circuit and toa separating position at which the second conductive contact separatesfrom the other external electrode; one third electrode is formed in theinspection circuit board; the other third electrode electricallyconnected to the second electrode through a wiring circuit is formed inthe second electrode; and a third conductive contact is arranged in themovable member or the fixed member, the third conductive contact makingcontact with the one third electrode and the other third electrode toelectrically connect these electrodes, when the movable member moves tothe contacting position.

According to such configuration, the movable member is preliminarilymade to move to the separating position, and the semiconductorintegrated circuit is held by the holding part with the one face thereoffacing the inspection circuit board, whereby the one external electrodeof the semiconductor integrated circuit makes contact with the firstconductive contact and thus, the first conductive contact connects thefirst electrode of the inspection circuit board and the one externalelectrode of the semiconductor integrated circuit.

Thereafter, the movable member is made to move from the separatingposition to the contacting position. As a result, the second conductivecontact makes contact with the external electrode on the other face ofthe semiconductor integrated circuit and thereby connects the secondelectrode of the wiring board and the other external electrode of thesemiconductor integrated circuit and at the same time, the thirdconductive contact makes contact with the one third electrode and theother third electrode to connect the two third electrodes.

Accordingly, the one external electrode of the semiconductor integratedcircuit is electrically connected through the first conductive contactto the inspection circuit board and at the same time, the other externalelectrode of the semiconductor integrated circuit is electricallyconnected to the inspection circuit board through the second conductivecontact, the wiring board and the third conductive contact toelectrically connect the semiconductor integrated circuit and themeasuring device, whereby electric characteristics can be inspected forthe semiconductor integrated circuit.

Consequently, as with the prior art, there is no need to add to the oneface of the semiconductor integrated circuit an inspection-use externalelectrode electrically connected to the external electrode on the otherface. Accordingly, the increase in the number of external electrodes ofthe semiconductor integrated circuit can be prevented and the overallsize of the semiconductor integrated circuit can be prevented frombecoming larger, allowing achievement of effects of high densityachieved by stacking.

A second invention is characterized in that characteristic impedance ofthe wiring board is matched to characteristic impedance of theinspection circuit board or the measuring device.

According to such configuration, the wiring board has impedance matchingwith the inspection circuit board or the measuring device, sosatisfactory high-frequency transmission characteristics can beachieved.

A third invention is characterized in that the overall length of thethird conductive contact is shorter than the sum of the overall lengthof the first conductive contact, the overall length of the secondconductive contact and the overall height of the semiconductorintegrated circuit.

According to such configuration, since it is generally difficult toachieve impedance matching between each of the first to third conductivecontacts and the inspection circuit board or measuring device, theoverall length of the third conductive contact difficult to be matchedin impedance is shortened, whereby deterioration of high-frequencytransmission characteristics introduced in the third conductive contactcan be suppressed.

A fourth invention is characterized in that at least one of the first tothird conductive contacts is anisotropic conductive rubber type.

A fifth invention is characterized in that the movable member isarranged in a conveying device conveying the semiconductor integratedcircuit onto the holding part; an adsorbing member adsorbing thesemiconductor integrated circuit between the first conductive contactand the second conductive contact is arranged in the movable member; theadsorbing member is movable between a protruding position protrudingtoward the inspection circuit board side and a retreating positionretreating toward the movable member side; when the movable member movesto the separating position, the adsorbing member moves to the protrudingposition and the semiconductor integrated circuit adsorbed by theadsorbing member separates from the second conductive contact; and whenthe movable member moves to the contacting position, the adsorbingmember moves to the retreating position and the other external electrodeof the semiconductor integrated circuit makes contact with the secondconductive contact.

According to such configuration, the adsorbing member adsorbs thesemiconductor integrated circuit, and the conveying device conveys thesemiconductor integrated circuit onto the holding part, along with themovable member. Then, the adsorbing by the adsorbing member is releasedand the movable member is made to move from the separating position tothe contacting position. As a result, the one external electrode of thesemiconductor integrated circuit makes contact with the first conductivecontact, and the first conductive contact connects the first electrodeof the inspection circuit board and the one external electrode of thesemiconductor integrated circuit. At the same time, the adsorbing membermoves from the protruding position to the retreating position, and theother external electrode of the semiconductor integrated circuit makescontact with the second conductive contact, and the second conductivecontact connects the other external electrode of the semiconductorintegrated circuit and the second conductive contact of the wiringboard. Further, the third conductive contact makes contact with the onethird electrode and the other third electrode to connect the two thirdelectrodes.

Accordingly, the one external electrode of the semiconductor integratedcircuit is electrically connected through the first conductive contactto the inspection circuit board and at the same time, the other externalelectrode of the semiconductor integrated circuit is electricallyconnected to the inspection circuit board through the second conductivecontact, the wiring board and the third conductive contact toelectrically connect the semiconductor integrated circuit and measuringdevice, whereby electric characteristics can be inspected for thesemiconductor integrated circuit.

After completion of the inspection, the adsorbing member adsorbs thesemiconductor integrated circuit, and the movable member is made to movefrom the contacting position to the separating position. As a result,the one external electrode of the semiconductor integrated circuitseparates from the first conductive contact and at the same time, theadsorbing member moves from the retreating position to the protrudingposition to cause the semiconductor integrated circuit to separate fromthe second conductive contact and further to cause the third conductivecontact to separate from the one third electrode or the other thirdelectrode. In this state, by use of the conveying device, thesemiconductor integrated circuit which has been inspected is conveyedfrom the holding part to another place, along with the movable member.

According to a sixth invention, there is provided an inspection methodusing an inspection device according to the first invention, wherein asemiconductor integrated circuit is held by a holding part; a movablemember is made to move to a contacting position to electrically connectthrough a first conductive contact a first electrode of an inspectioncircuit board and one external electrode of the semiconductor integratedcircuit and at the same time, to electrically connect through a secondconductive contact a second electrode of a wiring board and the otherexternal electrode of the semiconductor integrated circuit and further,to electrically connect through a third conductive contact one thirdelectrode of the inspection circuit board and the other third electrodeof the wiring board; an inspection signal is outputted from a measuringdevice to the one external electrode or the other external electrode ofthe semiconductor integrated circuit; and a response signal with respectto the inspection signal is received from the one or the other externalelectrode of the semiconductor integrated circuit by the measuringdevice to measure the response signal.

According to a seventh invention, there is provided an inspection devicefor inspecting electric characteristics of a semiconductor integratedcircuit having one external electrode and the other external electrodeon two faces thereof, the two faces being opposite to each other,wherein an inspection circuit board and an inspection-use semiconductorintegrated circuit (“inspection-use semiconductor integrated circuit” asdescribed herein indicates a semiconductor integrated circuitexclusively used for the above described semiconductor integratedcircuit inspection) are arranged facing each other; the inspectioncircuit board has a first electrode; the inspection-use semiconductorintegrated circuit has an identical structure to that of anothersemiconductor integrated circuit stacked on the semiconductor integratedcircuit by a package-on-package technique and at the same time, includesan inspection-use external electrode on a face thereof facing theinspection circuit board; a measuring device is connected to theinspection circuit board; a holding part holding the semiconductorintegrated circuit is formed between the inspection circuit board andthe inspection-use semiconductor integrated circuit; a first conductivecontact making contact with the first electrode of the inspectioncircuit board and the one external electrode of the semiconductorintegrated circuit facing the inspection circuit board to electricallyconnect these electrodes is arranged in a fixed member; a secondconductive contact making contact with the inspection-use externalelectrode of the inspection-use semiconductor integrated circuit and theother external electrode of the semiconductor integrated circuit facingthe inspection-use semiconductor integrated circuit to electricallyconnect these electrodes is arranged in a movable member; theinspection-use semiconductor integrated circuit is arranged in themovable member; and the movable member is movable to a contactingposition at which the second conductive contact makes contact with theother external electrode of the semiconductor integrated circuit and toa separating position at which the second conductive contact separatesfrom the other external electrode.

According to such configuration, after movement of the movable member tothe separating position, the semiconductor integrated circuit is held bythe holding part with the one face thereof facing the inspection circuitboard. As a result, the one external electrode of the semiconductorintegrated circuit makes contact with the first conductive contact, andthe first conductive contact connects the first electrode of theinspection circuit board and the one external electrode of thesemiconductor integrated circuit.

Thereafter, when the movable member is made to move from the separatingposition to the contacting position, the second conductive contact makescontact with the external electrode on the other face of thesemiconductor integrated circuit to connect the other external electrodeof the semiconductor integrated circuit and the inspection-use externalelectrode of the inspection-use semiconductor integrated circuit.

Accordingly, the one external electrode of the semiconductor integratedcircuit is electrically connected through the first conductive contactto the inspection circuit board and at the same time, the other externalelectrode of the semiconductor integrated circuit is electricallyconnected to the inspection-use semiconductor integrated circuit throughthe second conductive contact.

In this state, an inspection signal is outputted from the measuringdevice through the first conductive contact to the semiconductorintegrated circuit, and a first response signal with respect to theinspection signal is received through the first conductive contact fromthe semiconductor integrated circuit by the measuring device. Also, asecond response signal is outputted from the semiconductor integratedcircuit through the second conductive contact to the inspection-usesemiconductor integrated circuit, and a third response signal withrespect to the second response signal, or a dummy signal is outputtedfrom the inspection-use semiconductor integrated circuit through thesecond conductive contact to the semiconductor integrated circuit.Further, a fourth response signal with respect to the third responsesignal or the dummy signal is received through the first conductivecontact from the semiconductor integrated circuit by the measuringdevice. When the first response signal and fourth response signal thusreceived are measured, electric characteristics can be inspected for thesemiconductor integrated circuit.

Consequently, as with the prior art, there is no need to add to the oneface of the semiconductor integrated circuit an inspection-use externalelectrode electrically connected to the external electrode on the otherface. Accordingly, the increase in the number of external electrodes canbe prevented and the overall size of the semiconductor integratedcircuit can be prevented from becoming larger, allowing achievement ofeffects of high density achieved by stacking.

An eighth invention is characterized in that the measuring deviceoutputs an inspection signal to the semiconductor integrated circuit andalso receives a first response signal with respect to the inspectionsignal and further receives a third response signal or a fourth responsesignal with respect to a dummy signal; and the inspection-usesemiconductor integrated circuit receives a second response signaloutputted from the semiconductor integrated circuit and also outputs tothe semiconductor integrated circuit the third response signal withrespect to the second response signal, or the dummy signal.

A ninth invention is characterized in that a contact resistance betweenthe inspection-use external electrode of the inspection-usesemiconductor integrated circuit and the second conductive contact ismade to be smaller than a contact resistance between the externalelectrode of the semiconductor integrated circuit and the firstconductive contact.

According to such configuration, the electrical connection between theinspection-use external electrode of the inspection-use semiconductorintegrated circuit and the second conductive contact can be stabilizedfor a long period and thus, electric characteristics can be moreaccurately inspected for the semiconductor integrated circuit.

According to a tenth invention, there is provided an inspection methodusing an inspection device according to the seventh invention, wherein asemiconductor integrated circuit is held by a holding part; a movablemember is made to move to a contacting position to electrically connectthrough a first conductive contact a first electrode of an inspectioncircuit board and one external electrode of the semiconductor integratedcircuit and at the same time, to electrically connect through a secondconductive contact an inspection-use external electrode of aninspection-use semiconductor integrated circuit and the other externalelectrode of the semiconductor integrated circuit; an inspection signalis outputted from a measuring device through the first conductivecontact to the semiconductor integrated circuit; a first response signalwith respect to the inspection signal is received through the firstconductive contact from the semiconductor integrated circuit by themeasuring device; further, a second response signal is outputted fromthe semiconductor integrated circuit through the second conductivecontact to the inspection-use semiconductor integrated circuit; a thirdresponse signal with respect to the second response signal or a dummysignal is outputted from the inspection-use semiconductor integratedcircuit through the second conductive contact to the semiconductorintegrated circuit; a fourth response signal with respect to the thirdresponse signal or the dummy signal is received through the firstconductive contact from the semiconductor integrated circuit by themeasuring device; and the first response signal and the fourth responsesignal thus received are measured.

According to an eleventh invention, there is provided an inspectiondevice for inspecting electric characteristics for at least one of afirst semiconductor integrated circuit having one external electrode andthe other external electrode on two faces thereof, the two faces beingopposite to each other, and a second semiconductor integrated circuithaving an external electrode only on one face thereof, stacked on thefirst semiconductor integrated circuit by a package-on-packagetechnique, characterized in that a fixed member is arranged between aninspection circuit board and a movable member; a first electrode isarranged on the inspection circuit board; a measuring device isconnected to the inspection circuit board; a first conductive contact isarranged in the fixed member; the movable member is movable on amovement path on which the movable member approaches or separates fromthe fixed member, and constituted of a first movable body and a secondmovable body movable separately from each other; the second movable bodyis arranged facing the fixed member; the first movable body is arrangedbetween the second movable body and the fixed member; a secondconductive contact is arranged in the first movable body; a firstholding part holding the first semiconductor integrated circuit isformed between the fixed member and the first movable body; a secondholding part holding the second semiconductor integrated circuit isformed between the first movable body and the second movable body; thefirst conductive contact makes contact with the first electrode and theone external electrode of the first semiconductor integrated circuitheld by the first holding part to electrically connect these electrodes;the second conductive contact makes contact with the other externalelectrode of the first semiconductor integrated circuit held by thefirst holding part and the external electrode of the secondsemiconductor integrated circuit held by the second holding part toelectrically connect these electrodes; the first movable body is movableto a first contacting position at which the second conductive contactmakes contact with the other external electrode of the firstsemiconductor integrated circuit and to a first separating position atwhich the second conductive contact separates from the other externalelectrode of the first semiconductor integrated circuit; and the secondmovable body is movable to a second contacting position at which, thesecond movable body makes contact with the second semiconductorintegrated circuit held by the second holding part to press the externalelectrode of the second semiconductor integrated circuit against thesecond conductive contact, and to a second separating position at whichthe second movable body separates from the second semiconductorintegrated circuit.

According to such configuration, when electric characteristics areinspected for the first semiconductor integrated circuit, the secondsemiconductor integrated circuit is preliminarily held by the secondholding part, and the second movable body is preliminarily made to moveto the second contacting position. Accordingly, the second movable bodymakes contact with the second semiconductor integrated circuit to pressthe external electrode of the second semiconductor integrated circuitagainst the second conductive contact.

Thereafter, the first movable body is made to move to the firstseparating position, and the first semiconductor integrated circuit tobe inspected is held by the first holding part. Accordingly, the firstconductive contact makes contact with the first electrode and the oneexternal electrode of the first semiconductor integrated circuit.

Then, the first movable body is made to move to the first contactingposition, along with the second movable body. Accordingly, the secondconductive contact makes contact with the other external electrode ofthe first semiconductor integrated circuit and thus, the firstconductive contact connects the first electrode of the inspectioncircuit board and the one external electrode of the first semiconductorintegrated circuit. At the same time, the second conductive contactconnects the other external electrode of the first semiconductorintegrated circuit and the external electrode of the secondsemiconductor integrated circuit.

Accordingly, the one external electrode of the first semiconductorintegrated circuit is electrically connected through the firstconductive contact to the inspection circuit board and at the same time,the other external electrode of the first semiconductor integratedcircuit is electrically connected through the second conductive contactto the second semiconductor integrated circuit, whereby electriccharacteristics can be inspected for the first semiconductor integratedcircuit.

Thereafter, the first movable body is made to move from the firstcontacting position to the first separating position, along with thesecond movable body, and the first semiconductor integrated circuitwhich has been inspected is removed from the first holding part andthen, another first semiconductor integrated circuit to be inspected isheld by the first holding part to inspect the first semiconductorintegrated circuit by a procedure similar to the one described above.

Also, when electric characteristics are inspected for the secondsemiconductor integrated circuit, the first semiconductor integratedcircuit is preliminarily held by the first holding part, and the firstmovable body is preliminarily made to move to the first contactingposition. Accordingly, the second conductive contact makes contact withthe other external electrode of the first semiconductor integratedcircuit and at the same time, the first conductive contact connects thefirst electrode of the inspection circuit board and the one externalelectrode of the first semiconductor integrated circuit.

Thereafter, the second movable body is made to move to the secondseparating position, and the second semiconductor integrated circuit tobe inspected is held by the second holding part. Accordingly, the secondconductive contact makes contact with the external electrode of thesecond semiconductor integrated circuit. Then, the second movable bodyis made to move to the second contacting position. Accordingly, thesecond movable body makes contact with the second semiconductorintegrated circuit to press the external electrode of the secondsemiconductor integrated circuit against the second conductive contact,so that the second conductive contact connects the external electrode ofthe second semiconductor integrated circuit and the other externalelectrode of the first semiconductor integrated circuit.

Accordingly, the one external electrode of the first semiconductorintegrated circuit is electrically connected through the firstconductive contact to the inspection circuit board and at the same time,the external electrode of the second semiconductor integrated circuit iselectrically connected through the second conductive contact to theother external electrode of the first semiconductor integrated circuit,whereby electric characteristics can be inspected for the secondsemiconductor integrated circuit.

Thereafter, the second movable body is made to move from the secondcontacting position to the second separating position, and the secondsemiconductor integrated circuit which has been inspected is removedfrom the second holding part, and another second semiconductorintegrated circuit to be inspected is held by the second holding part toinspect the second semiconductor integrated circuit by a proceduresimilar to the one described above.

A twelfth invention is characterized in that when electriccharacteristics are inspected for the first semiconductor integratedcircuit, a contact resistance between the external electrode of thesecond semiconductor integrated circuit and the second conductivecontact is made to be smaller than a contact resistance between theexternal electrode of the first semiconductor integrated circuit and thefirst conductive contact; and when electric characteristics areinspected for the second semiconductor integrated circuit, a contactresistance between the external electrode of the first semiconductorintegrated circuit and the first conductive contact is made to besmaller than a contact resistance between the external electrode of thesecond semiconductor integrated circuit and the second conductivecontact.

Accordingly, when electric characteristics are not inspected for thesecond semiconductor integrated circuit but inspected only for the firstsemiconductor integrated circuit, electrical connection between theexternal electrode of the second semiconductor integrated circuit andthe second conductive contact can be stabilized for a long period andthus, electric characteristics can be more accurately inspected.

Also, when electric characteristics are not inspected for the firstsemiconductor integrated circuit but inspected only for the secondsemiconductor integrated circuit, electrical connection between theexternal electrode of the first semiconductor integrated circuit and thefirst conductive contact can be stabilized for a long period and thus,electric characteristics can be more accurately inspected.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a view of an inspection device according to Embodiment 1 ofthe present invention, illustrating a state in which a movable body ismade to move down to a lower limit position;

FIG. 1B is a view of an inspection device according to Embodiment 1 ofthe present invention, illustrating a state in which the movable body ismade to move up to a higher limit position;

FIG. 2 is a view observed along the line X-X of FIG. 1B;

FIG. 3 is a view observed along the line Y-Y of FIG. 1B;

FIG. 4 is a view observed along the line Z-Z of FIG. 1B;

FIG. 5 is a view of a semiconductor integrated circuit inspected by theinspection device;

FIG. 6 is a block diagram illustrating a signal transmission path of theinspection device;

FIG. 7A is a view of an inspection device according to Embodiment 2 ofthe present invention, illustrating a state in which a movable body ismade to move down to a lower limit position;

FIG. 7B is a view of an inspection device according to Embodiment 2 ofthe present invention, illustrating a state in which the movable body ismade to move up to a higher limit position;

FIG. 8A is a view of a flexible wiring board of the inspection device asseen from a fixed member side (from there beneath);

FIG. 8B is a view of a flexible wiring board of the inspection device,illustrating a view observed along the line X-X of FIG. 8A;

FIG. 9A is a view of an inspection device according to Embodiment 3 ofthe present invention, illustrating a state in which a movable body ismade to move down to a lower limit position;

FIG. 9B is a view of an inspection device according to Embodiment 3 ofthe present invention, illustrating a state in which the movable body ismade to move up to a higher limit position;

FIG. 10 is a plan view of a second conductive contact of the inspectiondevice;

FIG. 11 is a partial enlarged cross-sectional view of the secondconductive contact of the inspection device;

FIG. 12 is a partial enlarged cross-sectional view of a secondconductive contact of an inspection device according to Embodiment 4 ofthe present invention;

FIG. 13 is a view of an inspection device according to Embodiment 5 ofthe present invention, illustrating a state in which a semiconductorintegrated circuit is adsorbed to cause a movable body to move up to anupper limit position;

FIG. 14 is a view of the inspection device, illustrating a state inwhich the semiconductor integrated circuit is made to fall down to beheld by a holding part;

FIG. 15 is a view of the inspection device, illustrating a state inwhich the movable body is made to move down to a lower limit position;

FIG. 16A is a view of an inspection device according to Embodiment 6 ofthe present invention, illustrating a state in which a movable body ismade to move down to a lower limit position;

FIG. 16B is a view of an inspection device according to Embodiment 6 ofthe present invention, illustrating a state in which the movable body ismade to move up to a higher limit position;

FIG. 17 is a block diagram illustrating a signal transmission path ofthe inspection device;

FIG. 18A is a view of an inspection device when a first semiconductorintegrated circuit according to Embodiment 7 of the present invention isinspected, illustrating a state in which a movable frame is made to movedown to a first lower limit position;

FIG. 18B is a view of an inspection device when a first semiconductorintegrated circuit according to Embodiment 7 of the present invention isinspected, illustrating a state in which the movable frame is made tomove up to a first upper limit position;

FIG. 19A is a view of the inspection device when a second semiconductorintegrated circuit is inspected, illustrating a state in which a movablecover is made to move down to a second lower limit position;

FIG. 19B is a view of the inspection device when a second semiconductorintegrated circuit is inspected, illustrating a state in which themovable cover is made to move up to a second upper limit position;

FIG. 20 is a partial enlarged view of a conductive contact of a priorart inspection device;

FIG. 21 is a view of the prior art inspection device, illustrating astate in which a semiconductor integrated circuit having externalelectrodes on two opposite faces thereof is set; and

FIG. 22 is a view illustrating a method for inspecting the semiconductorintegrated circuit having external electrodes on two opposite facesthereof by use of the prior art inspection device.

DESCRIPTION OF THE EMBODIMENTS

The present invention will be described more in detail with reference tothe accompanying drawings.

Embodiment 1

First, Embodiment 1 will be described with reference to FIGS. 1A to 6.

As illustrated in FIGS. 1A to 4, an inspection device 1 serves toinspect electric characteristics of a semiconductor integrated circuit 2by use of a measuring device 4. As illustrated in FIG. 5, on twoopposite faces 2 a and 2 b of the semiconductor integrated circuit 2,there are formed a plurality of external electrodes 3 a and 3 b,respectively.

The inspection device 1 includes first to third conductive contacts 11to 13 of pogopin type (spring-incorporating contact pin type), a fixedmember 14, an inspection circuit board 15 connected to the measuringdevice 4, a movable member 16 and a wiring board 17.

Above the inspection circuit board 15, there is arranged the wiringboard 17 facing the inspection circuit board 15. The inspection circuitboard 15 is arranged detachably in a lower part of the fixed member 14by use of a screw (not illustrated) or the like. On the upper face ofthe inspection circuit board 15, there are formed a plurality of firstland electrodes 25 (an example of first electrode) and a plurality offixed-side third land electrodes 26 (an example of one third electrode).

Conductive contacts 11 to 13 are each constituted, similarly to priorart, of a cylinder body 19, a compression spring 20, one plunger 21 andthe other plunger 22. The first and second conductive contacts 11 and 12are equal in length, and the third conductive contact 13 is longer thanthe first and second conductive contacts 11 and 12.

The first conductive contact 11 serves to make contact with the firstland electrode 25 of the inspection circuit board 15 and the oneexternal electrode 3 a of the semiconductor integrated circuit 2 toelectrically connect these electrodes 25 and 3 a. A plurality of thefirst conductive contacts 11 are arranged in the fixed member 14 withthe one plunger 21 facing upward and the other plunger 22 facingdownward.

As illustrated in FIGS. 1A, 1B and 2, the fixed member 14 is constitutedof a frame being square in a plan view. In an upper part of the fixedmember 14 (i.e., between the inspection circuit board 15 and the wiringboard 17), there are arranged a holding part 24 holding thesemiconductor integrated circuit 2 and a protruding part 30 for locatingthe semiconductor integrated circuit 2 in the holding part 24. Aplurality of the protruding parts 30 are arranged so as to surround theperiphery of the holding part 24. In the holding part 24, thesemiconductor integrated circuit 2 is supported by the first conductivecontact 11.

As illustrated in FIGS. 1A, 1B and 3, the movable member 16 isconstituted of a frame being square in a plan view and configured so asto move in a vertical direction relative to the fixed member 14. Themovable member 16 is moved up and down by a drive device (notillustrated) constituted of a cylinder, a motor or the like.

In the movable member 16, there is formed a concave receiving part 18having an opening in the lower part thereof. As illustrated in FIG. 1A,at a lower limit position A (an example of contacting position), thefixed member 14 is received into the receiving part 18 of the movablemember 16; as illustrated in FIG. 1B, at an upper limit position B (anexample of separating position), the receiving part 18 separates upwardof the fixed member 14 and the fixed member 14 is exposed downward ofthe movable member 16.

As illustrated in FIGS. 1A, 1B and 4, the wiring board 17 is arrangeddetachably in an upper part of the movable member 16 by use of a screw(not illustrated) or the like. On the lower face of the wiring board 17,there are formed a plurality of second land electrodes 27 (an example ofsecond electrode) and a plurality of movable-side third land electrodes28 (an example of the other third electrode). The second land electrode27 and the movable-side third land electrode 28 are each electricallyconnected through a wiring circuit 23 formed in the wiring board 17.

A plurality of second and third conductive contacts 12 and 13 arearranged in the movable member 16 with the one plunger 22 facing upwardand the other plunger 22 facing downward. The second conductive contact12 serves to make contact with the second land electrode 27 of thewiring board 17 and the other external electrode 3 b of thesemiconductor integrated circuit 2 to electrically connect theseelectrodes 27 and 3 b. The third conductive contact 13 serves to makecontact with the fixed-side third land electrode 26 of the inspectioncircuit board 15 and the movable-side third land electrodes 28 of thewiring board 17 to electrically connect these electrodes 26 and 28.

The operation in the above configuration will now be described.

As illustrated in FIG. 1B, in a state in which the movable member 16 ismade to move up to the upper limit position B, the tip end of the otherplunger 22 of each of the first conductive contacts 11 contacts thefirst land electrode 25, and also the tip end of the one plunger 21 ofeach of the second conductive contacts 12 contacts the second landelectrode 27, and also the tip end of the one plunger 21 of each of thethird conductive contacts 13 contacts the movable-side third landelectrode 28.

In this state, when the semiconductor integrated circuit 2 is placed inthe holding part 24, the external electrode 3 a on the one face 2 a ofthe semiconductor integrated circuit 2 contacts the tip end of the oneplunger 21 of each of the first conductive contacts 11.

Thereafter, as illustrated in FIG. 1A, when the movable member 16 ismade to move down from the upper limit position B to the lower limitposition A, the fixed member 14 is received into the receiving part 18of the movable member 16, and the tip end of the other plunger 22 ofeach of the second conductive contacts 12 contacts the externalelectrode 3 b on the other face 2 b of the semiconductor integratedcircuit 2 and at the same time, the tip end of the other plunger 22 ofeach of the third conductive contact 13 contacts the fixed-side thirdland electrode 26.

Accordingly, the one external electrode 3 a of the semiconductorintegrated circuit 2 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the other external electrode 3 b of the semiconductor integratedcircuit 2 is electrically connected through the second conductivecontact 12, the wiring board 17 and the third conductive contact 13 tothe inspection circuit board 15. As a result, the semiconductorintegrated circuit 2 and the measuring device 4 are electricallyconnected, whereby electric characteristics can be inspected for thesemiconductor integrated circuit 2.

Consequently, as with the prior art, there is no need to add to the oneface 2 a of the semiconductor integrated circuit 2 an inspection-useexternal electrode electrically connected to the other externalelectrode 3 b. Accordingly, the increase in the number of externalelectrodes can be prevented and the overall size of the semiconductorintegrated circuit 2 can be prevented from becoming larger, allowingachievement of effects of high density achieved by stacking.

Also, when the movable member 16 is made to move down to the lower limitposition A as described above, the compression spring 20 in each of theconductive contacts 11 to 13 is compressed and due to a repulsive forceof these compression springs 20, there is generated a contact load ofthe plungers 21 and 22 of each of the conductive contacts 11 to 13, thecontact load being exerted on the respective electrodes 3 a, 3 b and 25to 28, and thus the plungers 21 and 22 of each of the conductivecontacts 11 to 13 are pressed against the respective electrodes 3 a, 3 band 25 to 28, allowing achievement of stable electrical conduction.

After completion of the inspection, as illustrated in FIG. 1B, when themovable member 16 is made to move up from the lower limit position A tothe upper limit position B, the tip end of the other plunger 22 of eachof the second conductive contact 12 separates upward from the otherexternal electrode 3 b of the semiconductor integrated circuit 2 and atthe same time, the tip end of the other plunger 22 of each of the thirdconductive contact 13 separates upward from the fixed-side third landelectrode 26.

A method for inspecting a semiconductor integrated circuit 2 by use ofthe above measuring device 1 will now be described.

As described above, as illustrated in FIG. 1A, when the movable member16 is made to move down to the lower limit position A, the first landelectrode 25 of the inspection circuit board 15 and the one externalelectrode 3 a of the semiconductor integrated circuit 2 are electricallyconnected through the first conductive contact 11 and at the same time,the second land electrode 27 of the wiring board 17 and the otherexternal electrode 3 b of the semiconductor integrated circuit 2 areelectrically connected through the second conductive contact 12, andalso the fixed-side third land electrode 26 of the inspection circuitboard 15 and the movable-side third land electrode 28 of the wiringboard 17 are electrically connected through the third conductive contact13.

Then, as illustrated in FIG. 6, with the external electrodes 3 a and 3 bof the semiconductor integrated circuit 2 electrically connected to themeasuring device 4, an inspection signal is supplied from the measuringdevice 4 to the external electrodes 3 a and 3 b for a given time periodand thereafter, a response signal with respect to the inspection signalis received from the external electrodes 3 a and 3 b by the measuringdevice 4 for a given time period, and the received response signal ismeasured by the measuring device 4 to determine a measuring result,whereby electric characteristics of the semiconductor integrated circuit2 are inspected.

In this case, an inspection signal with respect to one of or a pluralityof the one external electrodes 3 a is supplied from the measuring device4 through the inspection circuit board 15 and the first conductivecontact 11 to any of the one external electrodes 3 a. Further, aresponse signal outputted from one of or a plurality of the one externalelectrodes 3 a is received through the first conductive contact 11 andthe inspection circuit board 15 by the measuring device 4 and the signalis measured.

Also, an inspection signal with respect to one of or a plurality of theother external electrodes 3 b is supplied from the measuring device 4through the inspection circuit board 15, the third conductive contact13, the wiring board 17 and the second conductive contact 12 to any ofthe other external electrodes 3 b. Further, a response signal outputtedfrom one of or a plurality of the other external electrodes 3 b isreceived through the second conductive contact 12, the wiring board 17,the third conductive contact 13 and the inspection circuit board 15 bythe measuring device 4, and the signal is measured.

Embodiment 2

Embodiment 2 will now be described with reference to FIGS. 7A, 7B, 8Aand 8B.

As illustrated in FIGS. 7A and 7B, a movable member 16 is divided intoan external member 16 a and an internal member 16 b. The external member16 a and internal member 16 b are each square in a plan view. In thecenter of the external member 16 a, there is formed a concave void part35 having an opening in the lower part thereof. The internal member 16 bis arranged in the void part 35 and thereby mounted in the externalmember 16 a.

Also, as the wiring board, there is used a flexible wiring board 36being flexible and bendable. As illustrated in FIGS. 8A and 8B, in thecenter of the flexible wiring board 36, there is formed a hole 37. Theflexible wiring board 36 has a bended configuration; the periphery ofthe hole 37 (the center of the board 36) constitutes an upper part 36 a,and the outer circumferential part constitutes a lower part 36 bpositioned lower than the upper part 36 a.

The upper part 36 a of the flexible wiring board 36 is inserted into agap between the external member 16 a and the internal member 16 b andmounted therein. The lower part 36 b of the flexible wiring board 36 ismounted on an outer circumferential lower face of the external member 16a.

A plurality of the second land electrodes 27 are formed on the lowerface of the upper part 36 a of the flexible wiring board 36. A pluralityof movable-side third land electrodes 28 are formed on the lower face ofthe lower part 36 b of the flexible wiring board 36. First and thirdconductive contacts 11 and 13 are arranged in a fixed member 14. The tipend of the other plunger 22 of the third conductive contact 13 contactsa fixed-side third land electrode 26. Also, the second conductivecontact 12 and electrode 27 is arranged in the internal member 16 b ofthe movable member 16.

The inspection circuit board 15 and the measuring device 4 each have apredetermined characteristic impedance. The wiring width and interval ofthe flexible wiring board 36 is properly designed, whereby thecharacteristic impedance of the flexible wiring board 36 is matched tothat of the inspection circuit board 15 or the measuring device 4. Forexample, when the characteristic impedance of the inspection circuitboard 15 and that of the measuring device 4 are each 50Ω, thecharacteristic impedance of the flexible wiring board 36 is matched to50Ω.

The operation in the above configuration will be described below.

As illustrated in FIG. 7B, with the movable member 16 moved up to theupper limit position B and the one face 2 a thereof facing the fixedmember 14, a semiconductor integrated circuit 2 is placed in a holdingpart 24 of the fixed member 14. Accordingly, one external electrodes 3 aof the semiconductor integrated circuit 2 each contacts the tip end ofthe one plunger 21 of the first conductive contact 11.

Thereafter, as illustrated in FIG. 7A, when the movable member 16 ismade to move down to the lower limit position A, the tip end of theother plunger 22 of each of the second conductive contacts 12 contactsthe external electrode 3 b on the other face 2 b of the semiconductorintegrated circuit 2 and at the same time, the tip end of the oneplunger 21 of each of the third conductive contacts 13 contacts themovable-side third land electrode 28 of the flexible wiring board 36.

Accordingly, the one external electrode 3 a of the semiconductorintegrated circuit 2 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the other external electrode 3 b of the semiconductor integratedcircuit 2 is electrically connected through the second conductivecontact 12, the flexible wiring board 36 and the third conductivecontact 13 to the inspection circuit board 15. As a result, thesemiconductor integrated circuit 2 and the measuring device 4 areelectrically connected, whereby electric characteristics can beinspected for the semiconductor integrated circuit 2.

In this case, the flexible wiring board 36 has impedance matching witheach of the inspection circuit board 15 and the measuring device 4, sosatisfactory high-frequency transmission characteristics can beachieved.

Also, according to this Embodiment 2, the bendable flexible wiring board36 is used, so that the movable-side third land electrode 28 can bepositioned lower than the second land electrode 27 (i.e., in a directionof approaching the fixed member 14). Accordingly, when the overallheight of the semiconductor integrated circuit 2 is H (refer to FIG. 5),the overall length of the first conductive contact 11 is L1, the overalllength of the second conductive contact 12 is L2, and the overall lengthof the third conductive contact 13 is L3, the overall length L3 can beshorter than the sum of the overall height H and the overall lengths L1and L2 (i.e., L3<H+L1+L2).

Generally, it is difficult to achieve impedance matching between each ofthe first to third conductive contacts 11 to 13 and the inspectioncircuit board 15 or the measuring device 4. Thus, when the abovedimensional relationship (i.e., L3<H+L1+L2) is provided, the overalllength L3 of the third conductive contact 13 for which impedancematching is difficult to achieve is shorter than that according toEmbodiment 1 described above. Consequently, deterioration inhigh-frequency transmission characteristics introduced in the thirdconductive contact 13 can be suppressed.

Further, the flexible wiring board 36 is used, whereby the overalllengths L1 to L3 of the first to third conductive contacts 11 to 13 canall be standardized to the same value (for example, 3 mm). Accordingly,the first to third conductive contacts 11 to 13 can be standardized toone type, allowing reduction in the number of types of components.

Embodiment 3

Embodiment 3 will now be described with reference to FIGS. 9A to 11.

According to Embodiment 3, as illustrated in FIGS. 9A and 9B, instead ofthe second conductive contact 12 of pogopin type (spring-incorporatingcontact pin type) according to Embodiment 2 described above, a secondconductive contact 41 of anisotropic conductive rubber type is used.

The second conductive contact 41 is constituted of, as illustrated inFIGS. 10 and 11, a silicon rubber part 43 in the shape of square boardhaving a hole 42 in the center thereof, and a plurality of metalparticle including parts 45. These metal particle including parts 45have gold particles 44 (or metal particles composed of nickel coatedwith gold) having excellent conductivity and contained in siliconrubber. Due to the gold particles 44 of the metal particle includingpart 45, electrical conductivity is achieved only in one direction.

Also, in a movable member 16, there is formed a concave void part 47having an opening in the lower part thereof. In the ceiling of the voidpart 47, there is formed a protruding part 48 protruding downward (i.e.,toward a fixed member 14). The protruding part 48 is inserted into ahole 37 of the flexible wiring board 36 and a hole 42 of the siliconrubber part 43, and the flexible wiring board 36 is mounted on the lowerface (a face opposite to the fixed member 14) of the movable member 16,and the second conductive contact 41 is mounted on the lower face of aflexible wiring board 36. The tip end of each of the metal particleincluding parts 45 of the second conductive contact 41 contacts a secondland electrode 27 of the flexible wiring board 36.

The operation in the above configuration will be described below.

As illustrated in FIG. 9B, with the movable member 16 moved up to anupper limit position B and the one face 2 a thereof facing (downward)the fixed member 14, a semiconductor integrated circuit 2 is placed in aholding part 24 of the fixed member 14. Accordingly, the one externalelectrodes 3 a of the semiconductor integrated circuit 2 each contactsthe tip end of the one plunger 21 of the first conductive contact 11.

Thereafter, as illustrated in FIG. 9A, when the movable member 16 ismade to move down to the lower limit position A, the tip end of each ofthe metal particle including part 45 of the second conductive contact 41makes contact with the other external electrode 3 b of the semiconductorintegrated circuit 2 and at the same time, the tip end of the oneplunger 21 of each of the third conductive contacts 13 contacts themovable-side third land electrode 28 of the flexible wiring board 36.

Accordingly, the one external electrode 3 a of the semiconductorintegrated circuit 2 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the other external electrode 3 b of the semiconductor integratedcircuit 2 is electrically connected through the second conductivecontact 41, the flexible wiring board 36 and the third conductivecontact 13 to the inspection circuit board 15. As a result, thesemiconductor integrated circuit 2 and the measuring device 4 areelectrically connected, whereby electric characteristics can beinspected for the semiconductor integrated circuit 2.

Also, when the movable member 16 is made to move down to the lower limitposition A as described above, the compression spring 20 in the firstand third conductive contacts 11 and 13 is compressed and at the sametime, the metal particle including part 45 of the second conductivecontact 41 is compressed. Due to a repulsive force of the compressionspring 20, there is generated a contact load of the plungers 21 and 22of the first and third conductive contacts 11 and 13, the contact loadbeing exerted on the respective electrodes 3 a, 25, 26 and 28. At thesame time, due to elasticity of silicon rubber of the metal particleincluding part 45, there is generated a contact load of the particleincluding part 45 of the second conductive contact 41, the contact loadbeing exerted on the respective electrodes 3 b and 27. Accordingly, theplungers 21 and 22 of the first and third conductive contacts 11 and 13and the metal particle including part 45 of the second conductivecontact 41 are pressed against the respective electrodes 3 a, 3 b and 25to 28, allowing achievement of stable electrical conduction.

Embodiment 4

Embodiment 4 will now be described with reference to FIG. 12.

According to Embodiment 3 described above, the second conductive contact41 is constituted of the silicon rubber part 43 and a plurality of themetal particle including part 45. According to this Embodiment 4,however, as illustrated in FIG. 12, the second conductive contact 41 isconstituted of the silicon rubber part 43 and a plurality of metal wireincluding parts 53. These metal wire including parts 53 are composed ofa metal wire 54 of gold or nickel coated with gold having excellentconductivity, the metal wire 54 being included in silicon rubber in anoblique direction. Accordingly, in the metal wire including part 53,electrical conduction can be achieved only in one direction.

According to Embodiments 3 and 4 described above, the second conductivecontact 41 is anisotropic conductive rubber type. However, the first orthird conductive contact 11 or 13 may be anisotropic conductive rubbertype.

Embodiment 5

Embodiment 5 will now be described with reference to FIGS. 13 to 15.

As illustrated in FIGS. 13 to 15, a movable member 16 is arranged in anautomatic conveying device 60 of robot type conveying a semiconductorintegrated circuit 2 between a plurality of trays (not illustrated) anda holding part 24 of an inspection device 1.

The movable member 16 is constituted of an upper member 16 c in theshape of square board in a plan view and an lower member 16 d mounted ona lower face of the upper member 16 c. In the movable member 16, thereis formed a concave void part 47 having an opening in the lower partthereof. A flexible wiring board 36 is mounted on a lower face (a faceopposite to the fixed member 14) of the movable member 16, and a secondconductive contact 41 of anisotropic conductive rubber type is mountedon a lower face of the flexible wiring board 36, and the tip end of eachof the metal particle including part 45 of the second conductive contact41 contacts a second land electrode 27 of the flexible wiring board 36.

In the movable member 16, there is held an adsorbing block 61 (anexample of adsorbing member) adsorbing the semiconductor integratedcircuit 2 between a first conductive contact 11 and the secondconductive contact 41. The adsorbing block 61 is fit into a holding hole62 formed in the movable member 16 and held in a manner movable in avertical direction (a direction identical to the moving direction of themovable member 16). In the tip end of the adsorbing block 61, there isformed a guard part 61 a. As illustrated in FIG. 14, when the adsorbingblock 61 moves toward the inspection circuit board 15 side to reach aprotruding position C, the lower end of the adsorbing block 61 protrudesbelow the second conductive contact 41 through a hole 37 of the flexiblewiring board 36 and a hole 42 of the second conductive contact 41, andthe guard part 61 a is engaged with the lower member 16 d, whereby theadsorbing block 61 is prevented from moving down.

Also, when the adsorbing block 61 moves up, as illustrated in FIG. 15,toward the movable member 16 side to reach a retreating position D, thelower end of the adsorbing block 61 retreats above the lower end face ofthe second conductive contact 41 and the upper end face of the adsorbingblock 61 makes contact with the top back face of the holding hole 62,whereby the adsorbing block 61 is prevented from moving up.

On the lower end face of the adsorbing block 61, there is formed anadsorbing port 63 (refer to FIG. 14); on the outer circumferential faceof the adsorbing block 61, there is formed a sucking port 64. In theinterior of the adsorbing block 61, there is formed a squarely bentsucking path 65 communicating with the adsorbing port 63 and the suckingport 64. Also, in the movable member 16, there is formed a vacuum path66. One end of the vacuum path 66 communicates with the sucking port 64.Also, the other end of the vacuum path 66 is connected through aconnection pipe or the like to a vacuum source such as a vacuum pump.The vacuum path 66 is formed so that the length direction thereof is adirection (i.e., lateral direction) orthogonal to the moving direction(i.e., a vertical direction) of the adsorbing block 61.

The operation in the above configuration will be described below.

By use of the automatic conveying device 60, the movable member 16 isconveyed upward of the tray containing a semiconductor integratedcircuit 2 to be inspected. When the vacuum pump is activated, thepressure of the vacuum path 66 and sucking path 65 is made to be lowerthan the atmospheric pressure to adsorb the semiconductor integratedcircuit 2 contained in the tray to the adsorbing port 63 of theadsorbing block 61.

Thereafter, as illustrated in FIG. 13, by use of the automatic conveyingdevice 60, the semiconductor integrated circuit 2 is conveyed along withthe movable member 16 from above the tray onto the holding part 24 ofthe inspection device 1. At this time, the movable member 16 is locatedat the upper limit position B, and due to the own weight of theadsorbing block 61 and the weight of the semiconductor integratedcircuit 2, the adsorbing block 61 has moved down to the protrudingposition C. Accordingly, the semiconductor integrated circuit 2 isadsorbed and held to the adsorbing block 61 while not contacting thesecond conductive contact 41 and separating downward. Accordingly, adownward contact load by the second conductive contact 41 is not exertedon the semiconductor integrated circuit 2 as a downward reaction force.Consequently, the adsorbing force of the adsorbing block 61 is notcancelled by the above reaction force and exerted on the semiconductorintegrated circuit 2. As a result, a stable conveying operation ispossible.

Thereafter, as illustrated in FIG. 14, when the vacuum pump is stoppedto release the air, the adsorbing by the adsorbing block 61 is releasedand thus the semiconductor integrated circuit 2 falls down to be held bythe holding part 24. Accordingly, each of the one external electrodes 3a of the semiconductor integrated circuit 2 contacts the tip end of theone plunger 21 of the first conductive contact 11.

Thereafter, as illustrated in FIG. 15, when the movable member 16 ismade to move down from the upper limit position B to the lower limitposition A, the adsorbing block 61 is pushed up from the protrudingposition C to the retreating position D and thereby retreats, and eachof the other external electrodes 3 b of the semiconductor integratedcircuit 2 contacts the lower end of each of the metal particle includingpart 45 of the second conductive contact 41 and further, the tip end ofthe one plunger 21 of each of the third conductive contacts 13 contactsthe movable-side third land electrode 28 of the flexible wiring board36.

Accordingly, the one external electrode 3 a of the semiconductorintegrated circuit 2 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the other external electrode 3 b of the semiconductor integratedcircuit 2 is electrically connected through the second conductivecontact 41, the flexible wiring board 36 and the third conductivecontact 13 to the inspection circuit board 15. Accordingly, thesemiconductor integrated circuit 2 and the measuring device 4 areelectrically connected, whereby electric characteristics can beinspected for the semiconductor integrated circuit 2.

After completion of the inspection, the vacuum pump is activated toadsorb the semiconductor integrated circuit 2 to the adsorbing port 63.In this state, as illustrated in FIG. 13, the movable member 16 is madeto move up from the lower limit position A to the upper limit positionB. Accordingly, the one external electrode 3 a of the semiconductorintegrated circuit 2 separates upward from the first conductive contact11 and at the same time, the movable-side third land electrodes 28separates from the third conductive contact 13. Further, due to the ownweight of the adsorbing block 61 and the weight of the semiconductorintegrated circuit 2, the adsorbing block 61 moves down to theprotruding position C, and the semiconductor integrated circuit 2 isadsorbed and held to the adsorbing block 61 while not contacting thesecond conductive contact 41 and separating downward.

Thereafter, by use of the automatic conveying device 60, thesemiconductor integrated circuit 2 is conveyed along with the movablemember 16 upward of another vacant tray. Then, when the vacuum pump isstopped to release the air, the adsorbing by the adsorbing block 61 isreleased to move the semiconductor integrated circuit 2 which has beeninspected, from the adsorbing block 61 into the vacant tray.

While the adsorbing block 61 moves up and down between the protrudingposition C and the retreating position D, the vacuum path 66communicates from a lateral direction with the sucking port 64 of theadsorbing block 61. Accordingly, the length direction of the vacuum path66 is not identical with the moving direction of the adsorbing block 61,being a direction dislocated by 90 degrees. Consequently, when thevacuum pump is activated to cause a sucking force to be generated,vertical movement of the adsorbing block 61 is not interrupted by theabove sucking force.

Embodiment 6

Embodiment 6 will now be described with reference to FIGS. 16A, 16B and17.

As illustrated in FIGS. 16A and 16B, an inspection device 1 includesfirst and second conductive contacts 11 and 12 of pogopin type(spring-incorporating contact pin), a fixed member 14, an inspectioncircuit board 15 connected to a measuring device 4, a movable member 16and an inspection-use semiconductor integrated circuit 70.

The inspection-use semiconductor integrated circuit 70 is arranged abovethe inspection circuit board 15, facing the inspection circuit board 15.The inspection circuit board 15 is arranged detachably in a lower partof the fixed member 14 by use of a screw (not illustrated) or the like.On the upper face of the inspection circuit board 15, there are formed aplurality of first land electrodes 25 (an example of first electrode)

The conductive contacts 11 and 12 are each constituted of, similarly toprior art, a cylinder body 19, a compression spring 20, one plunger 21and the other plunger 22. The plungers 21 and 22 are each coated withgold.

The first conductive contact 11 serves to make contact with the firstland electrode 25 of the inspection circuit board 15 and the oneexternal electrode 3 a of the semiconductor integrated circuit 2 toelectrically connect these electrodes 25 and 3 a. A plurality of thefirst conductive contacts 11 are arranged in the fixed member 14 withthe one plunger 21 facing upward and the other plunger 22 facingdownward.

The fixed member 14 is constituted of a frame being square in a planview. In an upper part of the fixed member 14 (i.e., between theinspection circuit board 15 and the inspection-use semiconductorintegrated circuit 70), there are arranged a holding part 24 holding thesemiconductor integrated circuit 2 and a protruding part 30 for locatingthe semiconductor integrated circuit 2 in the holding part 24. Theprotruding parts 30 are arranged so as to surround the periphery of theholding part 24. In the holding part 24, the semiconductor integratedcircuit 2 is supported by the first conductive contact 11.

The movable member 16 is constituted of a main body frame 16 e beingsquare in a plan view and a cover 16 f mounted detachably in an upperpart of the main body frame 16 e. The movable member 16 is movable in avertical direction relative to the fixed member 14, and a drive device,constituted of a cylinder, a motor or the like, for moving up and downthe movable member 16 is arranged.

The inspection-use semiconductor integrated circuit 70 is mounteddetachably in a lower part of the cover 16 f of the movable member 16.The inspection-use semiconductor integrated circuit 70 has a structuresimilar to that of another semiconductor integrated circuit stacked onthe semiconductor integrated circuit 2 by use of a package-on-packagetechnique. Also, the inspection-use semiconductor integrated circuit 70has a plurality of inspection-use external electrodes 71 on the lowerface thereof (i.e., a face opposite to the inspection circuit board 15).These inspection-use external electrodes 71 are flat in shape, the basematerial thereof being made of copper or tungsten, the surface thereofbeing coated with gold.

Each of the second conductive contacts 12 serves to make contact withthe inspection-use external electrode 71 of the inspection-usesemiconductor integrated circuit 70 and the other external electrode 3 bof the semiconductor integrated circuit 2 to electrically connect theseelectrodes 71 and 3 b. A plurality of the second conductive contacts 12are arranged in the main body frame 16 e of the movable member 16.

The movable member 16 moves up and down between a lower limit position A(an example of contacting position) and an upper limit position B (anexample of separating position). As illustrated in FIG. 16A, at thelower limit position A, the second conductive contact 12 makes contactwith the other external electrode 3 b of the semiconductor integratedcircuit 2; as illustrated in FIG. 16B, at the upper limit position B,the second conductive contact 12 separates upward from the otherexternal electrode 3 b.

The operation in the above configuration will be described below.

As illustrated in FIG. 16B, in a state in which the movable member 16 ismade to move up to the upper limit position B, the tip end of the otherplunger 22 of each of the first conductive contacts 11 contacts thefirst land electrode 25, and also the tip end of the one plunger 21 ofeach of the second conductive contact 12 contacts the inspection-useexternal electrode 71 of the inspection-use semiconductor integratedcircuit 70.

In this state, when the semiconductor integrated circuit 2 is placed inthe holding part 24, the one external electrode 3 a of the semiconductorintegrated circuit 2 contacts the tip end of the one plunger 21 of eachof the first conductive contacts 11.

Thereafter, as illustrated in FIG. 16A, when the movable member 16 ismade to move down from the upper limit position B to the lower limitposition A, the tip end of the other plunger 22 of each of the secondconductive contacts 12 contacts the other external electrode 3 b of thesemiconductor integrated circuit 2.

Accordingly, the one external electrode 3 s of the semiconductorintegrated circuit 2 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the other external electrode 3 b of the semiconductor integratedcircuit 2 is electrically connected through the second conductivecontact 12 to the inspection-use semiconductor integrated circuit 70,whereby electric characteristics can be inspected for the semiconductorintegrated circuit 2.

Consequently, as with the prior art, there is no need to add to the oneface 2 a of the semiconductor integrated circuit 2 an inspection-useexternal electrode electrically connected to the other externalelectrode 3 b. Accordingly, the increase in the number of externalelectrodes can be prevented and the overall size of the semiconductorintegrated circuit 2 can be prevented from becoming larger, allowingachievement of effects of high density achieved by stacking.

Also, when the movable member 16 is made to move down to the lower limitposition A as described above, the compression spring 20 in each of theconductive contacts 11 and 12 is compressed and due to a repulsive forceof these compression springs 20, there is generated a contact load ofthe plungers 21 and 22 of each of the conductive contacts 11 and 12, thecontact load being exerted on the respective electrodes 3 a, 3 b, 25 and71. Accordingly, the plungers 21 and 22 of each of the conductivecontacts 11 and 12 are pressed against the respective electrodes 3 a, 3b, 25 and 71, thus allowing achievement of stable electrical conduction.

After completion of the inspection, when the movable member 16 is madeto move up from the lower limit position A to the upper limit positionB, the tip end of the other plunger 22 of each of the second conductivecontact 12 separates upward from the other external electrode 3 b of thesemiconductor integrated circuit 2.

Also, the inspection-use external electrode 71 of the inspection-usesemiconductor integrated circuit 70 is flat in shape and coated withgold and thus, the contacting part between the inspection-use externalelectrode 71 and the one plunger 21 coated with gold of the secondconductive contact 12 constitutes a gold-to-gold contact, so that thecontact resistance thereof is small and thus, satisfactory electricalconduction is achieved. Consequently, electric characteristics can beinspected in a stable manner.

Also, the contact resistance between the inspection-use externalelectrode 71 of the inspection-use semiconductor integrated circuit 70and the second conductive contact 12 is smaller than the contactresistance between the external electrode 3 a of the semiconductorintegrated circuit 2 to be inspected and the first conductive contact11. Thus, electric characteristics can be accurately inspected for thesemiconductor integrated circuit 2.

A method for inspecting a semiconductor integrated circuit 2 using theinspection device 1 will now be described.

As described above, while the semiconductor integrated circuit 2 is heldby the holding part 24, the movable member 16 is made to move down tothe lower limit position A to electrically connect through the firstconductive contact 11 the first land electrodes 25 of the inspectioncircuit board 15 and the one external electrode 3 a of the semiconductorintegrated circuit 2 and at the same time, to electrically connectthrough the second conductive contact 12 the inspection-use externalelectrode 71 of the inspection-use semiconductor integrated circuit 70and the other external electrode 3 b of the semiconductor integratedcircuit 2.

Then, as illustrated in FIG. 17, an inspection signal is supplied fromthe measuring device 4 through the first conductive contact 11 to theone external electrode 3 a of the semiconductor integrated circuit 2 fora given time period, and a first response signal with respect to theinspection signal is received from the one external electrode 3 a of thesemiconductor integrated circuit 2 through the first conductive contact11 by the measuring device 4.

Further, a second response signal is supplied from the other externalelectrode 3 b of the semiconductor integrated circuit 2 through thesecond conductive contact 12 to the inspection-use external electrode 71of the inspection-use semiconductor integrated circuit 70, and a thirdresponse signal with respect to the second response signal, or a dummysignal is outputted from the inspection-use semiconductor integratedcircuit 70 through the second conductive contact 12 to the otherexternal electrode 3 b of the semiconductor integrated circuit 2.

Then, a fourth response signal with respect to the third response signalor the dummy signal is received from the one external electrode 3 a ofthe semiconductor integrated circuit 2 through the first conductivecontact 11 by the measuring device 4. When the first response signal andfourth response signal received by the measuring device 4 are measuredand a measurement result is determined, electric characteristics of thesemiconductor integrated circuit 2 are inspected.

When an electrical connection between the inspection circuit board 15and the inspection-use semiconductor integrated circuit 70 is separatelymade, fault diagnosis of the inspection-use semiconductor integratedcircuit 70 can also be performed. In the event that the inspection-usesemiconductor integrated circuit 70 is in a failed state, theinspection-use semiconductor integrated circuit 70 is removed from thecover 16 f of the movable member 16 to replace it with a normalinspection-use semiconductor integrated circuit 70.

Embodiment 7

Embodiment 7 according to the present invention will be described.

As illustrated in FIGS. 18A, 18B and 19, in an inspection device 1,electric characteristics can be inspected for one of, or both of thesemiconductor integrated circuits (a first semiconductor integratedcircuit 101 and a second semiconductor integrated circuit 105). Thefirst semiconductor integrated circuit 101 has a plurality of oneexternal electrodes 102 a on one face 101 a thereof and a plurality ofthe other external electrodes 102 b on the other face 101 b thereof. Thesecond semiconductor integrated circuit 105 is stacked on the firstsemiconductor integrated circuit 101 by a package-on-package techniqueand has a plurality of external electrodes 106 only on one face (lowerface) thereof.

The inspection device 1 includes an inspection circuit board 15, firstand second conductive contacts 11 and 12 of pogopin type, the firstsemiconductor integrated circuit 101, the second semiconductorintegrated circuit 105, a fixed member 103 and a movable member 104.

The fixed member 103 has a frame configuration being square in a planview and arranged between the inspection circuit board 15 and themovable member 104.

The inspection circuit board 15 is arranged detachably in a lower partof the fixed member 103 by a screw (not illustrated) or the like. On theupper face of the inspection circuit board 15, there are formed aplurality of first land electrodes 25 (an example of first electrode).Also, a measuring device 4 is connected to the inspection circuit board15.

The movable member 104 is vertically movable on a movement path 110 onwhich the movable member 104 approaches or separates from the fixedmember 103, and constituted of a movable frame 104 a (an example offirst movable body) and a movable cover 104 b (an example of secondmovable body) movable separately from each other. The movable cover 104b is positioned above the fixed member 103, facing the fixed member 103and arranged so as to cover the upper part of the movable frame 104 a.The movable frame 104 a is formed into a square in a plan view andarranged between the movable cover 104 b and the fixed member 103.

Between the fixed member 103 and the movable frame 104 a, there isformed a first holding part 111; the first semiconductor integratedcircuit 101 is held by the first holding part 111. In an upper part ofthe fixed member 103, there is arranged a first protruding part 113locating the first semiconductor integrated circuit 101 in the firstholding part 111. The first protruding part 113 is arranged so as tosurround the periphery of the first holding part 111.

Between the movable frame 104 a and the movable cover 104 b, there isformed a second holding part 112; the second semiconductor integratedcircuit 105 is held by the second holding part 112. In an upper part ofthe movable frame 104 a, there is arranged a second protruding part 114locating the second semiconductor integrated circuit 105 in the secondholding part. 112. The second protruding part 114 is arranged so as tosurround the periphery of the second holding part 112.

The first conductive contact 11 serves to make contact with the firstland electrode 25 and the one external electrode 102 a of the firstsemiconductor integrated circuit 101 to electrically connect theseelectrodes 25 and 102 a. A plurality of the first conductive contacts 11are arranged in the fixed member 103. One plunger 21 of each of thefirst conductive contacts 11 is made to face upward and the otherplunger 22 thereof is made to face downward. As illustrated in FIG. 18B,in the first holding part 111, the first semiconductor integratedcircuit 101 is supported by the first conductive contact 11.

The second conductive contact 12 serves to make contact with the otherexternal electrode 102 b of the first semiconductor integrated circuit101 and the external electrode 106 of the second semiconductorintegrated circuit 105 to electrically connect these electrodes 102 band 106. A plurality of the second conductive contacts 12 are arrangedin the movable frame 104 a. As illustrated in FIG. 19B, in the secondholding part 112, the second semiconductor integrated circuit 105 issupported by the second conductive contact 12.

The first and second conductive contacts 11 and 12 are each constitutedof a cylinder body 19, a compression spring 20, one plunger 21 and theother plunger 22. The plungers 21 and 22 are each coated with gold.

The movable frame 104 a and movable cover 104 b of the movable member104 are separately moved on the movement path 110 by a drive device (notillustrated) constituted of a cylinder, a motor or the like. Morespecifically, the movable frame 104 a is movable, along with the movablecover 104 b, to a first lower limit position A1 (an example of firstcontacting position) illustrated in FIG. 18A and a first upper limitposition B1 (an example of first separating position) illustrated inFIG. 18B.

As illustrated in FIG. 18A, when the movable frame 104 a moves to thefirst lower limit position A1, the other plunger 22 of the secondconductive contact 12 makes contact with the other external electrode102 b of the first semiconductor integrated circuit 101. Also, asillustrated in FIG. 18B, when the movable frame 104 a moves to the firstupper limit position B1, the second conductive contact 12 separatesupward from the other external electrode 102 b.

Also, the movable cover 104 b is movable to a second lower limitposition A2 (an example of second contacting position) illustrated inFIG. 19A and to a second upper limit position B2 (an example of secondseparating position) illustrated in FIG. 19B.

As illustrated in FIG. 19A, when the movable cover 104 b moves to thesecond lower limit position A2, the movable cover 104 b makes contactwith the second semiconductor integrated circuit 105 held by the secondholding part 112, and the external electrode 106 of the secondsemiconductor integrated circuit 105 is pressed against the one plunger21 of the second conductive contact 12. Also, as illustrated in FIG.19B, when the movable cover 104 b moves to the second upper limitposition B2, the movable cover 104 b separates upward from the secondsemiconductor integrated circuit 105.

The operation in the above configuration will be described below.

When electric characteristics are not inspected for the secondsemiconductor integrated circuit 105 but inspected for the firstsemiconductor integrated circuit 101, the movable cover 104 b ispreliminarily moved up to the upper limit position B2 to cause thesecond holding part 112 to hold the second semiconductor integratedcircuit 105, and then the movable cover 104 b is made to moved own tothe second lower limit position A2. Accordingly, as illustrated in FIG.18B, the movable cover 104 b makes contact with the second semiconductorintegrated circuit 105, and the external electrode 106 of the secondsemiconductor integrated circuit 105 is pressed against the one plunger21 of the second conductive contact 12.

In this case, as illustrated in FIGS. 18A and 18B, the externalelectrode 106 of the second semiconductor integrated circuit 105 to benot inspected is flat in shape, the base material thereof being made ofcopper or tungsten, the surface thereof being coated with gold.

Thereafter, as illustrated in FIG. 18B, the movable frame 104 a is madeto move up, integrally with the movable cover 104 b, to the first upperlimit position B1, and the first semiconductor integrated circuit 101 tobe inspected is made to held by the first holding part 111. Accordingly,the first conductive contact 11 makes contact with the first landelectrode 25 of the inspection circuit board 15 and the one externalelectrode 102 a of the first semiconductor integrated circuit 101.

Then, as illustrated in FIG. 18A, the movable frame 104 a is made to bemoved down, integrally with the movable cover 104 b, to the first lowerlimit position A1. Accordingly, the other plunger 22 of the secondconductive contact 12 makes contact with the other external electrode102 b of the first semiconductor integrated circuit 101, so that thefirst conductive contact 11 connects the first land electrode 25 of theinspection circuit board 15 and the one external electrode 102 a of thefirst semiconductor integrated circuit 101 and at the same time, thesecond conductive contact 12 connects the other external electrode 102 bof the first semiconductor integrated circuit 101 and the externalelectrode 106 of the second semiconductor integrated circuit 105.

Accordingly, the one external electrode 102 a of the first semiconductorintegrated circuit 101 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the other external electrode 102 b of the first semiconductorintegrated circuit 101 is electrically connected through the secondconductive contact 12 to the second semiconductor integrated circuit105, whereby electric characteristics can be inspected for the firstsemiconductor integrated circuit 101.

Thereafter, as illustrated in FIG. 18B, the movable frame 104 a is madeto move up, integrally with the movable cover 104 b, from the firstlower limit position A1 to the first upper limit position B1, and thefirst semiconductor integrated circuit 101 which has been inspected isremoved from the first holding part 111, and another first semiconductorintegrated circuit 101 to be inspected is made to be held by the firstholding part 111, and this first semiconductor integrated circuit 101 isinspected by a procedure similar to the one described above.

In this case, the external electrode 106 of the second semiconductorintegrated circuit 105 to be not inspected is flat in shape and coatedwith gold and thus, when the external electrode 106 makes contact withthe one plunger 21 coated with gold of the second conductive contact 12,this constitutes a gold-to-gold contact, so that the contact resistancethereof is small and thus, satisfactory electrical conduction isachieved. Consequently, electric characteristics can be inspected in astable manner.

Also, the contact resistance between the external electrode 106 of thesecond semiconductor integrated circuit 105 and the second conductivecontact 12 is smaller than the contact resistance between the externalelectrode 102 a of the first semiconductor integrated circuit 101 to beinspected and the first conductive contact 11, so that electriccharacteristics can be accurately inspected for the first semiconductorintegrated circuit 101.

When electric characteristics are not inspected for the firstsemiconductor integrated circuit 101 but inspected for the secondsemiconductor integrated circuit 105, the movable frame 104 a ispreliminarily made to move up, integrally with the movable cover 104 b,to the first upper limit position B1 to cause the first holding part 111to hold the first semiconductor integrated circuit 101, and the movablecover 104 b is made to move down, integrally with the movable cover 104b, to the first lower limit position A1. Accordingly, the other plunger22 of the second conductive contact 12 makes contact with the otherexternal electrode 102 b of the first semiconductor integrated circuit101 and at the same time, the first conductive contact 11 connects thefirst land electrodes 25 of the inspection circuit board 15 and the oneexternal electrode 102 a of the first semiconductor integrated circuit101.

In this case, as illustrated in FIGS. 19A and 19B, the externalelectrodes 102 a and 102 b of the first semiconductor integrated circuit101 to be not inspected are flat in shape, the base material thereofbeing made of copper or tungsten, the surface thereof being coated withgold.

Thereafter, as illustrated in FIG. 19B, the movable cover 104 b is madeto move up to the second upper limit position B2, and the secondsemiconductor integrated circuit 105 to be inspected is made to be heldby the second holding part 112. Accordingly, the one plunger 21 of thesecond conductive contact 12 makes contact with the external electrode106 of the second semiconductor integrated circuit 105.

Then, as illustrated in FIG. 19A, the movable cover 104 b is made tomove down to the second lower limit position A2. Accordingly, themovable cover 104 b makes contact with the second semiconductorintegrated circuit 105, and the external electrode 106 of the secondsemiconductor integrated circuit 105 is pressed against the one plunger21 of the second conductive contact 12. Thus, the second conductivecontact 12 connects the external electrode 106 of the secondsemiconductor integrated circuit 105 and the other external electrode102 b of the first semiconductor integrated circuit 101.

Accordingly, the one external electrode 102 a of the first semiconductorintegrated circuit 101 is electrically connected through the firstconductive contact 11 to the inspection circuit board 15 and at the sametime, the external electrode 106 of the second semiconductor integratedcircuit 105 is electrically connected through the second conductivecontact 12 to the other external electrode 102 b of the firstsemiconductor integrated circuit 101, whereby electric characteristicscan be inspected for the second semiconductor integrated circuit 105.

Thereafter, as illustrated in FIG. 19B, the movable cover 104 b is madeto move up from the second lower limit position A2 to the second upperlimit position B2, and the second semiconductor integrated circuit 105which has been inspected is removed from the second holding part 112,and another second semiconductor integrated circuit 105 to be inspectedis made to be held by the second holding part 112, and this secondsemiconductor integrated circuit 105 is inspected by a procedure similarto the one described above.

In this case, the external electrodes 102 a and 102 b of the firstsemiconductor integrated circuit 101 to be not inspected are flat inshape and coated with gold and thus, when the external electrode 102 amakes contact with the one plunger 21 coated with gold of the firstconductive contact 11, this constitutes a gold-to-gold contact, so thatthe contact resistance thereof is small and thus, satisfactoryelectrical conduction is achieved. Consequently, electriccharacteristics can be inspected in a stable manner.

Also, the contact resistance between the external electrode 102 a of thefirst semiconductor integrated circuit 101 to be not inspected and thefirst conductive contact 11 is smaller than the contact resistancebetween the external electrode 106 of the second semiconductorintegrated circuit 105 to be inspected and the second conductive contact12, so that electric characteristics can be accurately inspected for thesecond semiconductor integrated circuit 105.

For the external electrode 102 a of the first semiconductor integratedcircuit 101 and the external electrode 106 of the second semiconductorintegrated circuit 105, the base material thereof is made of copper ortungsten and higher in hardness than a solder ball electrode or the likeoften used as the electrode and thus, hardly changed in shape by thecontact with the conductive contacts 11 and 12. Consequently, stableelectrical conduction is achieved for a long time.

As described above, the inspection device according to the presentinvention is appropriate for inspecting a semiconductor integratedcircuit having electrodes on two opposite faces thereof.

1. An inspection device for inspecting electric characteristics of asemiconductor integrated circuit having one external electrode and theother external electrode on two faces thereof, said two faces beingopposite to each other, wherein an inspection circuit board having afirst electrode and a wiring board having a second electrode arearranged facing each other; a measuring device is connected to theinspection circuit board; a holding part holding the semiconductorintegrated circuit is formed between the inspection circuit board andthe wiring board; a first conductive contact making contact with thefirst electrode of the inspection circuit board and the one externalelectrode of the semiconductor integrated circuit facing the inspectioncircuit board to electrically connecting these electrodes is arranged ina fixed member; a second conductive contact making contact with thesecond electrode of the wiring board and the other external electrode ofthe semiconductor integrated circuit facing the wiring board toelectrically connecting these electrodes is arranged in a movablemember; the wiring board is arranged in the movable member; the movablemember is movable to a contacting position at which the secondconductive contact makes contact with the other external electrode ofthe semiconductor integrated circuit and to a separating position atwhich the second conductive contact separates from the other externalelectrode; one third electrode is formed in the inspection circuitboard; the other third electrode electrically connected to the secondelectrode through a wiring circuit is formed in the second electrode;and a third conductive contact is arranged in the movable member or thefixed member, the third conductive contact making contact with the onethird electrode and the other third electrode to electrically connectingthese electrodes, when the movable member moves to the contactingposition.
 2. The inspection device according to claim 1, whereincharacteristic impedance of the wiring board is matched tocharacteristic impedance of the inspection circuit board or themeasuring device.
 3. The inspection device according to claim 2, whereinthe overall length of the third conductive contact is shorter than thesum of the overall length of the first conductive contact, the overalllength of the second conductive contact and the overall height of thesemiconductor integrated circuit.
 4. The inspection device according toclaim 1, wherein at least one of the first to third conductive contactsis anisotropic conductive rubber type.
 5. The inspection deviceaccording to claim 1, wherein the movable member is arranged in aconveying device conveying the semiconductor integrated circuit onto theholding part; an adsorbing member adsorbing the semiconductor integratedcircuit between the first conductive contact and the second conductivecontact is arranged in the movable member; the adsorbing member ismovable between a protruding position protruding toward the inspectioncircuit board side and a retreating position retreating toward themovable member side; when the movable member moves to the separatingposition, the adsorbing member moves to the protruding position, and thesemiconductor integrated circuit adsorbed by the adsorbing memberseparates from the second conductive contact; and when the movablemember moves to the contacting position, the adsorbing member moves tothe retreating position, and the other external electrode of thesemiconductor integrated circuit makes contact with the secondconductive contact.
 6. An inspection method using an inspection deviceaccording to claim 1, wherein a semiconductor integrated circuit is heldby a holding part; a movable member is made to move to a contactingposition to electrically connect through a first conductive contact afirst electrode of an inspection circuit board and one externalelectrode of the semiconductor integrated circuit and at the same time,to electrically connect through a second conductive contact a secondelectrode of a wiring board and the other external electrode of thesemiconductor integrated circuit and further, to electrically connectthrough a third conductive contact a third electrode of the inspectioncircuit board and the other third electrode of the wiring board; aninspection signal is outputted from a measuring device to the oneexternal electrode or the other external electrode of the semiconductorintegrated circuit; and a response signal with respect to the inspectionsignal is received from the one external electrode or the other externalelectrode of the semiconductor integrated circuit by the measuringdevice to measure the response signal.
 7. An inspection device forinspecting electric characteristics of a semiconductor integratedcircuit having one external electrode and the other external electrodeon two faces thereof, said two faces being opposite to each other,wherein an inspection circuit board and an inspection-use semiconductorintegrated circuit are arranged facing each other; the inspectioncircuit board has a first electrode; the inspection-use semiconductorintegrated circuit has an identical structure to that of anothersemiconductor integrated circuit stacked on the semiconductor integratedcircuit by a package-on-package technique and at the same time, includesan inspection-use external electrode on a face thereof facing theinspection circuit board; a measuring device is connected to theinspection circuit board; a holding part holding the semiconductorintegrated circuit is formed between the inspection circuit board andthe inspection-use semiconductor integrated circuit; a first conductivecontact making contact with the first electrode of the inspectioncircuit board and the one external electrode of the semiconductorintegrated circuit facing the inspection circuit board to electricallyconnect these electrodes is arranged in a fixed member; a secondconductive contact making contact with the inspection-use externalelectrode of the inspection-use semiconductor integrated circuit and theother external electrode of the semiconductor integrated circuit facingthe inspection-use semiconductor integrated circuit to electricallyconnect these electrodes is arranged in a movable member; theinspection-use semiconductor integrated circuit is arranged in themovable member; and the movable member is movable to a contactingposition at which the second conductive contact makes contact with theother external electrode of the semiconductor integrated circuit and toa separating position at which the second conductive contact separatesfrom the other external electrode.
 8. The inspection device according toclaim 7, wherein the measuring device outputs an inspection signal tothe semiconductor integrated circuit and also receives a first responsesignal with respect to the inspection signal and further receives afourth response signal with respect to a third response signal or adummy signal; and the inspection-use semiconductor integrated circuitreceives a second response signal outputted from the semiconductorintegrated circuit and also outputs to the semiconductor integratedcircuit the third response signal with respect to the second responsesignal, or the dummy signal.
 9. The inspection device according to claim7, wherein a contact resistance between the inspection-use externalelectrode of the inspection-use semiconductor integrated circuit and thesecond conductive contact is made to be smaller than a contactresistance between the external electrode of the semiconductorintegrated circuit and the first conductive contact.
 10. An inspectionmethod using an inspection device according to claim 7, wherein asemiconductor integrated circuit is held by a holding part; a movablemember is made to move to a contacting position to electrically connectthrough a first conductive contact a first electrode of an inspectioncircuit board and one external electrode of the semiconductor integratedcircuit and at the same time, to electrically connect through a secondconductive contact an inspection-use external electrode of aninspection-use semiconductor integrated circuit and the other externalelectrode of the semiconductor integrated circuit; an inspection signalis outputted from a measuring device through the first conductivecontact to the semiconductor integrated circuit; a first response signalwith respect to the inspection signal is received through the firstconductive contact from the semiconductor integrated circuit by themeasuring device; a second response signal is outputted from thesemiconductor integrated circuit through the second conductive contactto the inspection-use semiconductor integrated circuit; a third responsesignal with respect to the second response signal or a dummy signal isoutputted from the inspection-use semiconductor integrated circuitthrough the second conductive contact to the semiconductor integratedcircuit; a fourth response signal with respect to the third responsesignal or the dummy signal is received through the first conductivecontact from the semiconductor integrated circuit by the measuringdevice; and the first response signal and the fourth response signalthus received are measured.
 11. An inspection device for inspectingelectric characteristics for at least one of a first semiconductorintegrated circuit having one external electrode and the other externalelectrode on two faces thereof, said two faces being opposite to eachother, and a second semiconductor integrated circuit having an externalelectrode only on one face thereof and stacked on the firstsemiconductor integrated circuit by a package-on-package technique,wherein a fixed member is arranged between an inspection circuit boardand a movable member; a first electrode is arranged in the inspectioncircuit board; a measuring device is connected to inspection circuitboard; a first conductive contact is arranged in the fixed member; themovable member is movable on a movement path on which the movable memberapproaches or separates from the fixed member, and constituted of afirst movable body and a second movable body movable separately fromeach other; the second movable body is arranged facing the fixed member;the first movable body is arranged between the second movable body andthe fixed member; a second conductive contact is arranged in the firstmovable body; a first holding part holding the first semiconductorintegrated circuit is formed between the fixed member and the firstmovable body; a second holding part holding the second semiconductorintegrated circuit is formed between the first movable body and thesecond movable body; the first conductive contact makes contact with thefirst electrode and the one external electrode of the firstsemiconductor integrated circuit held by the first holding part toelectrically connect these electrodes; the second conductive contactmakes contact with the other external electrode of the firstsemiconductor integrated circuit held by the first holding part and theexternal electrode of the second semiconductor integrated circuit heldby the second holding part to electrically connect these electrodes; thefirst movable body is movable to a first contacting position at whichthe second conductive contact makes contact with the other externalelectrode of the first semiconductor integrated circuit, and to a firstseparating position at which the second conductive contact separatesfrom the other external electrode of the first semiconductor integratedcircuit; and the second movable body is movable to a second contactingposition at which the second movable body makes contact with the secondsemiconductor integrated circuit held by the second holding part topress the external electrode of the second semiconductor integratedcircuit against the second conductive contact, and to a secondseparating position at which the second movable body separates from thesecond semiconductor integrated circuit.
 12. The inspection deviceaccording to claim 11, wherein when electric characteristics areinspected for the first semiconductor integrated circuit, a contactresistance between the external electrode of the second semiconductorintegrated circuit and the second conductive contact is made to besmaller than a contact resistance between the external electrode of thefirst semiconductor integrated circuit and the first conductive contact;and when electric characteristics are inspected for the secondsemiconductor integrated circuit, a contact resistance between theexternal electrode of the first semiconductor integrated circuit and thefirst conductive contact is made to be smaller than a contact resistancebetween the external electrode of the second semiconductor integratedcircuit and the second conductive contact.